Valve-grinding device.



G. H. FIELD. VALVE GRINDING DEVIGB.

APPLICATION rum) 1m, 1910.

97 442 I Patented Dec. 13,1910;

UNITED STATES PATENT OFFICE.

CHARLES H. FIELD, OF SYRACUSE, NEW YORK.

VALVE-GRINDING nnvron.

,To all whom it may concern Be it known that I, CHARLES H.FIELD, of Syracuse in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Valve-Grinding'Devices, of which 'the following, taken in connection with the accompanyingdrawings, is

, a full, clear, and exact description.

. grlndin center tive means for gri This invention relates to certain improvements in valve grinding and reseating devices and is particularly useful in grinding" the valves of gas engines. These valves are usually providedwith a stem guided in the valve casing and with aslotted head for the reception of a screw driver or other tool whereby the valve may be rotated against its seat.

My object is to provide a simple and eifecn p(ping and holding the valve'casing and gm ing-the rotary actuatmg means by which the valve or other or cutting tool may be accurately to itsseat, y

Another object is to equip this device with additional means wherebythe valve or other cutting tool m normally forced away from the va ve seat/and into. view to permit the inspection of the valve or valve seat as-t-he work of grinding ro'gresses;

Other objects an uses relating to specific parts of the mechanism will be brought out ,m the following description.

' In the drawlngsz Figure 1 is a side elevation of a valve grinding mechanism showing the valve as moved away from its seat and out of the casing to permit inspection of such valve and the valve seat, the partsbeing in their normal position for grinding. Fig. 2 is'avertical sectional view taken on line 2-2, Fig. 1. Figs. 3, 4 and 5 are horizontal sectional views taken respectively on lines 33,4.4 and 55,'Fi 1, omitting the valve casing and valve in Figs. 4 and 5. Fig. 6 is a front face view of a modified form of valve reseating device showing a different form of valve, partly in section, as mounted therein.

In carrying out the objects stated, I provide an upright supporting arm or bracket -1 referably angular in cross section and a apted to be clamped in a vise or equivalent gripping device, not shown, to hold it at the desired height convenient for operation, the up r end of the bracket having a laterally so set a1m;--2 terminating in a split hub or clahi'p" -3 for receiving Specification of Letters Patent. Patented Dec, 13 1910, application filed January 7, 1910.

Serial No. 536,815.

and retaining a guide bushing A screw driver spindle --5 is 'rotat-ingly mounted in the bushing -4: and also movable axially thereinand is provided with an angular head 6 adapted to. be engaged screws --11, the 'hub'of the arm --9- al though not shown in top plan, being of substantially she same .form as that shown in fie valve casing, as a-, containing a f valve seat band a valve '-c-- to be ground or fitted, is clamped between and held in place by the outer ends of the arms -7 and '8-, so as to prevent endwise movement of the casing and at the same time affording means for centering the casing with its valve seat and valve coaxial with the axis of the valve rotating spindle '5.

In the particular device shown in Figs. 1 and 2, the valve c is provided with a stein d which is guided in a suitable opening e in the base of the casing -a just below the seat b-. The 0 en end of the valve casing through which he valve is inserted and removed and to which a cap is usually fitted,-is generally provided with an annular projection, as f-, concentric with the axis of the valve, the lower end of the valve casing bein also provided with a similar annular lnil) concentric with the axis of'the valve and in order that the casing may be properly centered in the grinding apparatus, the free end of the arm -7 is forked forming diverging arms -12 spaced apart a distance corresponding to the diameter of the or shoulder g also I flanged portion fand having the base portions thereof concentric with said flan e, so as to fit around the same and there y center and hold the upper end of the valve casing in a fixed position with its valve seat coaxial with-the axis of-the valve actuating spindle 5. For the same purpose, the free end of the underlying arm S is formed with a socket -13 receiving and movable stem or spindle --l5 which is' mounted in a central opening 16 there in. This stem -15- is preferably of the same diameter as that of the valve stem -d so as to enable it to move readily and easily in the guide opening ein the valve casing for.a purpose hereinafter described. The free end of the lower arm 9 is also-provided with a guide opening 17 for receiving and guiding the lower end of the vertically movable stem -.-15-. The intermediate portion of this spindle 15- is threaded at 18- and receives an adjustable nut or limiting stop '19, said spindle '15 being normally elevated until limited by .the engagement. of the nut 1 19- against the. lower end of the hub 14- by a coil spring--20 which en circles the portion of the spindle 15- bea tween the'nut 19 -and upper face of thearn 9 the ends of the spring butting against washers -2l and 22- respectively to prevent turning of the spring when the upp the nut 19 is adj usted; In' placing this device for operating upon the valve, the valve casing a' is'properly seated upon the outer end of the arm 8, in the manner described,"after which the arm 17 is adjusted to properly engage and center er end of the valve-casing for firmly holding the latter in its adjusted position. When this is done, the valve c is adjusted in the casing 'aand the nut -l9 is then adjusted in such manner as to allow thespindle 15- to be forced upwardly by the spring --20 'sufiiciently to normally elevate the valve c "from its seat and out of the-casing to permit the inspection of both the Valve and its seat without removing the valve from the valve casing. The arm 9 is then adjusted to produce just sufiicient tension upon the spring 20' to automatically raise the spindle 15, valve -c and driving spindle 5- when the downward pressure upon the latter is relieved.

Now when the parts are adjusted in the manner just described, the operator applies the bit-stock or equivalent means to the screw driver spindle 5-'- for pressing the latter downwardly and thereby depressing the valve to its seat and similarly pressing the spindle'--15 against the action of the spring -20, under which conditions the valve may be rotated back and forth against its seat and its position changed rotarially at any time, the spring 20- serving to elevate the valve from i ts seat for inspection, as before described, by merely releasing the downward pressure upon the spindle 5-.

During the operation of fitting'the valve to its seat, a suitable grinding paste may be applied at intervals to the valve when forced to its position for inspection, such paste in conjunction with the rotation of the valve upon its seat serving to effect a close fit between the two arts.

It is now evldent from the foregoing description that when the valve is centered and manipulated by the mechanism described, any skilled or. unskilled operator may establish a perfect fit between the valve and its seat Without any more care or painstaking than merely depressing and'rotating the valve against such seat.- w

In ,Fig. 6 I have shown a rotary axially movable spindle'5" as journaled in the bushing--4- on the arm -2- and nor mally elevated by a coil 5 ring; 20- which encircles the spindle and is interposed between the washer --24-\ onthe bushing 4 and a shoulder=.'-25 on the he'ad 6. The lower end of this spindle is provided with a drill chuck 26- for re: cciving and holding a grinding tool spindle 27- carrying the cutter 28--. Upon the arm S is supported a valve casing 29' havin a valve seat 30, said valve casing being leld in place between the arms -7 and -8 in substantially the same manner as previously described for the valve casing a. In this modification, the spring 20 is adjusted so as to "normally elevate the cutter 28' away from the valve seat 30. and out of the casing 29- s'ufiiciently to permit an inspection of the valve seat without removing the valve casing from the holding device.

In operatioirthe head 6- is engaged by a bit-stock or similar device whereby the operator may depress and rotate the cutter 28 against the action of the spring 20 which when the pressure is relieved operates to automatically lift the cutter from the valve in the manner previously mentioned. It is apparent from this latter description that the cutter -28 may be operated against the valve seat 30-'in substantially the same manner as the valve -c, the only difference being in the. device shown in Figs. 1 and 2 the valve and its seat are ground to fit each other while in Fig. 6,

the valve seat alone is ground to the desired form and degree of perfection.

What I claim is;

1. In a valve grinding device, a main supporting bracket, a pair of arms mounted on the bracket one above the other for receiving and clamping between them a valve casing, the upper arm being adjustable toward and from the other arm and provided with a vertical opening therethrough, coaxial valve operating spindles alined with said opening and movable axially, and means iiicluding a coil spring surrounding'one of the valve operating spindles for moving such spindle axially in one direction.

2'. In a valve grinding device, an upright bracket, clamping arms mounted upon said bracketone above the other, the upper clamping arin being adj ustalole' vertically and provided with a vertical bpeniiig therethrough larger than the valve to be ground,

means for clamping the adjustable arm in its adjusted position, coaxial valve operating spindles alined with said opening and inovable axially, and a spring operatively con-' nected to oneof the valve operating spindles for moving it axially in one direction.

23. In a valve grinding device, an upright l racket having a lateral ofiset, a rotary axi-- ally iiidvable spindle mounted in said ofi'set, laterally projecting arms mounted upon and adjustable relatively to the bracket toward and from each other for receiving and -1 clamping between them a valve casing, an

the last named arm and nut for elevating the additional spindle and thereby raising the valve from its seat.

4. In a valve reseating device,-an upright supporting bracket, :1 pair of arms'mounted adjustable lengthwise of the upon and clamping between them a valve bracket; for easing, an upon and adjustable lengthwise of the bracket, a vertically movable spindle guided in one of the first named arms and in said additional arm and normally spring pressed unvardl an ad'ustable sto shoulder 011. 5

l 5&1 J l said spin e for engaging one of said arms and limiting the upward movement of the; spindle, a spring interposed between the stop shoulder and said additional arm for forcing the. spindle upward, and a rotary 0 vertically movable valve operating member guided on the bracket and coaxial with said spindle. l

'5. In a valve reseating device, an upright v bracket, an arm projecting late ally from 55 tlu upper end-of the bracket, a rotary valve operating .lneniber movable vertically in said than, a forked arni adj ustably mounted upon the bracket below the first named arm,

an additional arm adjustably' mounted on so the bracket below the forked arm, a vertically movable spindle guided in the additional arm, an adjustable stop on said spindle engaging the under side of the additional arm, a spring for elevating the spin-' o5 dle, and adjustable means for varying the tension of the spring. i In witness whereof I have hereunto set my hand on this 27th day of December I900.

CHARLES H. FIELD. lVitness-cs:

H. F. Ciiasic, A. L. liTMPHHEY.

additional arm. also iiiou'nted 40 

